n African Zoology - Morphological studies on sp. (Gastropoda: Planorbidae) from Nchout Monoun, Cameroon

Volume 41, Issue 2
  • ISSN : 1562-7020
  • E-ISSN: 2224-073X
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Since 1990, diploid &lt;I&gt;Bulinus&lt;/I&gt; sp. populations have been reported from many sites in the volcanic western Bamileke and Bamoun plateau in Cameroon; starch gel electrophoresis of enzymes and chromosome analyses have revealed a single band in hydroxybutyrate dehydrogenase (HBDH), isocitrate dehydrogenase (IDH), and a diploid chromosome number of 2n = 36. Several samples have been tentatively identified as <I>B. natalensis&lt;/I&gt; (Küster, 1841) on the basis of observations on the shell and radula. The present study is a preliminary analysis of the characteristics of the shell and the radula of the snails from Nchout Monoun Crater Lake (Monoun Koumogoum) for adequate comparisons with the widely studied <I>B. natalensis / tropicus&lt;/I&gt; complex from East and South Africa. Comparison of the ratio of shell length to aperture length (L/AL), plotted against shell length (L) in a scatter diagram, showed a 47% overlap between the dimensions of the Nchout Monoun sample and those from KwaZulu-Natal. From previous observations on the diploid chromosome number, single electrophoretic bands on HBDH and IDH enzyme systems, euphallic genital system, arrowhead-shaped mesocones and the characteristic features of the shell, we conclude that &lt;I&gt;Bulinus&lt;/I&gt; sp. from Nchout Monoun is closely related to <I>B. natalensis.&lt;/I&gt;

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